Personnally I can't stand gutters. They cause ice dams in cold climates, they trap moisture against the wood the brace against & rot it, the fasteners eventually weaken unless much care is taken durning the installation & allow at place for moisture to again cause rot, rodents love them. Unless the gutter is really strong (wooden, which has it's own down side) it's subject to wind & ice pulling it away from the structure. The only reason for a gutter in the beginning was to direct drinking water into a barrel, old customs die hard. Reasons for a gutter; if you've a precious garden or to direct water away from a foundation that leaks in water, or you want to collect water for another reason, like to drink or to water a garden in arid areas or to shed water from an entrance/exit so steps or such don't freeze up or become dangerous. Otherwise I'd pull the dam things down. Any building center sells a plastic mesh that works just as fine & is way cheaper & very, VERY easy to install,,,,,,,if you don't mind the height & can access it easy enough.

Barry, that's a professional opinion